<template>
  <div>
    <div class='shopcart'>
      <div class='content' @click='toggleList'>
        <div class='content-left'>
          <div class='logo-wrapper'>
            <div class='logo' :class="{'highlight':totalCount>0}">
              <i class='iconfont icon_shopping_cart' :class="{'highlight':totalCount>0}">&#xe608;</i>
            </div>
            <div class='num' v-show='totalCount>0'>{{totalCount}}</div>
          </div>
          <div class='price' :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
          <div class='desc'>还需配送费{{deliveryPrice}}元</div>
        </div>
        <div class='content-right' @click.stop.prevent='pay'>
          <div class='pay' :class="{'highlight':this.totalPrice>=20}">
            {{payDesc}}
          </div>
        </div>
      </div>
      <transition name='fold'>
        <div class='shopcart-list' v-show='listShow'>
          <div class='list-header'>
            <h1 class='title'>购物车</h1>
            <span class='empty' @click='empty'>清空</span>
          </div>
          <div class='list-content' ref='listContent'>
            <ul>
              <li
                class='food'
                v-for='(food,index) in selectFoods'
                :key='index'
              >
                <span class='name'>{{food.name}}</span>
                <div class='price'>
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class='cartcontrol-wrapper'>
                  <cartcontrol :food='food'></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
      </div>
      <transition name='fade'>
        <div
          class='list-mask'
          @click='hideList()'
          v-show='listShow'>
        </div>
      </transition>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import cartcontrol from 'components/cartcontrol/cartcontrol'
export default {
  name: 'shopcart',
  props: {
    selectFoods: {
      type: Array
    },
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 0
    }
  },
  data () {
    return {
      listShow: false
    }
  },
  computed: {
    totalPrice () {
      let total = 0
      this.selectFoods.forEach((food) => {
        total += food.price * food.count
      })
      return total
    },
    totalCount () {
      let count = 0
      this.selectFoods.forEach((food) => {
        count += Number(food.count)
      })
      return count
    },
    payDesc () {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元起送`
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice
        return `还差￥${diff}元起送`
      } else {
        return '去结算'
      }
    }
  },
  methods: {
    toggleList () {
      if (!this.totalCount) {
        return
      }
      this.listShow = !this.listShow
      this.$nextTick(() => {
        if (!this.scroll) {
          this.scroll = new BScroll(this.$refs.listContent, {
            click: true
          })
        } else {
        // 重新计算better-scroll高度
          this.scroll.refresh()
        }
      })
    },
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0
      })
      this.listShow = false
    },
    hideList () {
      this.listShow = false
    },
    pay () {
      if (this.totalPrice < this.minPrice) {
        return
      }
      window.alert(`支付${this.totalPrice}元`)
    }
  },
  components: {
    cartcontrol
  }
}
</script>

<style lang='stylus' scoped>
  @import '../../common/stylus/mixin'
  .shopcart
    position:fixed
    left:0
    bottom: 0
    height: 48px
    width: 100%
    z-index: 50
    .content
      display: flex
      background: #141d27
      font-size: 0
      .content-left
        flex:1
        .logo-wrapper
          display: inline-block
          vertical-align: top
          position: relative
          top: -10px
          margin: 0 12px
          padding: 6px
          width: 56px
          height: 56px
          box-sizing: border-box
          border-radius: 50%
          background: #141d27
          .logo
            width: 100%
            height: 100%
            position: relative
            border-radius: 50%
            background: #2b343c
            text-align: center
            &.highlight
              background: rgb(0,160,220)
            .icon_shopping_cart
              font-size: 34px
              line-height: 44px
              color: #80858a
              &.highlight
                color: #fff
          .num
            font-size: 9px
            font-weight: 700
            text-align: center
            color: rgb(255,255,255)
            width: 24px
            height: 16px
            line-height: 16px
            position: absolute
            top: 0
            right: 0
            background: rgb(240,20,20)
            z-index: 5
            box-shadow: 0 4px 8px 0 rgba(0,0,0,0.4)
            border-radius: 16px
        .price
          display: inline-block
          vertical-align: top
          line-height: 24px
          margin-top: 12px
          color: #80858a
          padding-right: 12px
          box-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, 0.2)
          font-size: 16px
          font-weight: 700
          &.highlight
            color: #fff
        .desc
          display: inline-block
          color: rgb(255,255,255,0.4)
          font-size: 12px
          margin: 12px 0 0 12px
          line-height: 24px
      .content-right
        width: 105px
        flex: 0 0 105px
        .pay
          line-height:48px
          height: 48px
          color: rgb(255,255,255,0.4)
          font-size: 12px
          font-weight: 700
          text-align: center
          background: #2b333b
          &.highlight
            background: #00b43c
            color: #fff
    .shopcart-list
      position: absolute
      top: 0
      left: 0
      z-index: -1
      width: 100%
      transform: translate3d(0,-100%,0)
      &.fold-enter-active, &.fold-leave-active
        transition: all 0.5s
      &.fold-enter,&.fold-leave-to
        transform: translate3d(0,0,0)
      .list-header
        height: 40px
        line-height: 40px
        padding: 0 18px
        background: #f3f5f7
        border-bottom: 1px solid rgba(7,17,27,0.1)
        .title
          float: left
          font-size: 14px
          color: rgb(7,17,27)
        .empty
          float: right
          font-size: 12px
          color: rgb(0,160,220)
      .list-content
        padding: 0 18px
        max-height: 217px
        overflow: hidden
        background: #fff
        .food
          position: relative
          padding: 12px 0
          box-sizing: border-box
          border-1px(rgba(7,17,27,0.1))
          .name
            line-height: 24px
            font-size: 14px
            color: rgb(7,17,27)
          .price
            position: absolute
            right: 90px
            top: 12px
            line-height: 24px
            color: rgb(240,20,20)
            font-size: 12px
            font-weight: 700
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 6px
  .list-mask
    position: fixed
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: 40
    backdrop-fliter: blur(10px)
    background: rgba(7,17,27,0.6)
    opacity: 1
    &.fade-enter-active, &.fade-leave-active
      transition: all 0.5s
    &.fade-enter, &.fade-leave-to
      opacity: 0
      background: rgba(7,17,27,0)
</style>
